tomato/src/sdlrenderer_texture_uploader.cpp
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fix texture blend mode, reenabling transparency
2024-06-01 12:51:50 +02:00

75 lines
1.9 KiB
C++

#include "./sdlrenderer_texture_uploader.hpp"
#include <cassert>
#include <cstdint>
#include <cstring>
#include <iostream>
SDLRendererTextureUploader::SDLRendererTextureUploader(SDL_Renderer* renderer_) :
renderer(renderer_)
{
}
uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter, Access access) {
// TODO: test if pitch is 4 or 4*width
SDL_Surface* surf = SDL_CreateSurfaceFrom(
(void*)data,
width, height,
4*width,
SDL_PIXELFORMAT_RGBA32 // auto big/little
);
assert(surf); // TODO: add error reporting
SDL_Texture* tex = SDL_CreateTexture(
renderer,
surf->format->format,
access == Access::STREAMING ? SDL_TEXTUREACCESS_STREAMING : SDL_TEXTUREACCESS_STATIC,
surf->w, surf->h
);
assert(tex); // TODO: add error reporting
// TODO: error reporting
SDL_UpdateTexture(tex, nullptr, surf->pixels, surf->pitch);
SDL_BlendMode surf_blend_mode = SDL_BLENDMODE_NONE;
if (SDL_GetSurfaceBlendMode(surf, &surf_blend_mode) == 0) {
SDL_SetTextureBlendMode(tex, surf_blend_mode);
}
if (filter == NEAREST) {
SDL_SetTextureScaleMode(tex, SDL_SCALEMODE_NEAREST);
} else if (filter == LINEAR) {
SDL_SetTextureScaleMode(tex, SDL_SCALEMODE_LINEAR);
}
SDL_DestroySurface(surf);
return reinterpret_cast<uint64_t>(tex);
}
bool SDLRendererTextureUploader::updateRGBA(uint64_t tex_id, const uint8_t* data, size_t size) {
auto* texture = static_cast<SDL_Texture*>(reinterpret_cast<void*>(tex_id));
if (texture == nullptr) {
return false;
}
uint8_t* pixels = nullptr;
int pitch = 0;
if (SDL_LockTexture(texture, nullptr, (void**)&pixels, &pitch) != 0) {
std::cerr << "SDLRTU error: failed locking texture '" << SDL_GetError() << "'\n";
return false;
}
std::memcpy(pixels, data, size);
SDL_UnlockTexture(texture);
return true;
}
void SDLRendererTextureUploader::destroy(uint64_t tex_id) {
SDL_DestroyTexture(static_cast<SDL_Texture*>(reinterpret_cast<void*>(tex_id)));
}